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23

A. They have great difficulty living by themselves
B. They have little hope of getting any family care
C. They have fond memories of their good old days
D. They have a sense of independence and autonomy

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24

A. People in many parts of the world preferred small-sized families
B. There have been extended families in most parts of the world
C. Many elderly people were unwilling to take care of their grandchildren
D. So many young Americans refused to live together with their parents

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25

A. Leave their young generations alone
B. Avoid being a burden to their children
C. Stay healthy by engaging in joyful activities
D. View things from their children’s perspective

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机器的最小制造单元是：

A. 机器
B. 机构
C. 构件
D. 零件

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机器的最小运动单元是：

A. 机器
B. 机构
C. 构件
D. 零件

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23

A. They have great difficulty living by themselves B. They have little hope of getting any family care C. They have fond memories of their good old days D. They have a sense of independence and autonomy

24

25

机器的最小制造单元是：

机器的最小运动单元是：

A. They have great difficulty living by themselves
B. They have little hope of getting any family care
C. They have fond memories of their good old days
D. They have a sense of independence and autonomy